129447900 has 54 divisors (see below), whose sum is σ = 405750072. Its totient is φ = 34519200.

The previous prime is 129447869. The next prime is 129447949. The reversal of 129447900 is 9744921.

129447900 is a `hidden beast` number, since 129 + 447 + 90 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 71016 + ... + 72815.

Almost surely, 2^129447900 is an apocalyptic number.

129447900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129447900 is an abundant number, since it is smaller than the sum of its proper divisors (276302172).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129447900 is a wasteful number, since it uses less digits than its factorization.

129447900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143851 (or 143841 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 129447900 is about 11377.5173038761. The cubic root of 129447900 is about 505.8615492935.

It can be divided in two parts, 1294 and 47900, that added together give a palindrome (49194).

The spelling of 129447900 in words is "one hundred twenty-nine million, four hundred forty-seven thousand, nine hundred".